Apparatus for uninterrupted reproduction of disk phonographrecords



Feb. 22, 1949. R. E. STANTON 2,462,435

' APPARATUS FOR UNINTERRUPTED REPRODUCTION 0F DISK PHONOGRAPH RECORDSFiled May 15, 1945 4 Sheets-Sheet 1 r INVENTOR. ROBERT E. STANTONATTORNEY l I I I l l I, l l. J

Feb. 22, 1949. R. E. STANTON 2,462,435

APPARATUS FOR UNINTERRUPTED REPRODUCTION OF DISK PHONOGRAPH RECORDSFiled May 15, 1945 4 Sheets-Sheet 2 INVENTOR. ROBERT E. STANTON ATTORNEYFeb. 22 1949. R. E. STANTON APPARATUS FOR UNINTERRUPTED REPRODUCTION OFDISK PHONOGRAPH RECORDS 4 Sheets-Sheet 3 Filed May 15, 1945 R mm NT EN m5 E T. R E B 0 R WWW ATTORNEY Feb. 22, 1949. R. E. STANTON 2,462,435

APPARATUS FOR UNINTERRUPTED REPRODUCTION OF DISK PHONOGRAPH RECORDS 1Filed May 15, 1945 4 Sheets-Sheet 4 A SELECTIVE 2 SPEED DRIVE ELEMENTINVENTOR. ROBERTE. STANTON ATTORNEY.

atented Feb. 22, 194$ UNITED STATES 2,462,435

APPARATUS Fo'n UNI TERRUPTED RE; PRODUCTION OF DISK PHONOGR'APH RECORDSRobert E. Stanton, Denver, 0010.

Application May 15, 1945, Stimson-2,817

50mins- (c1. ire-100.4)

1 I'his invention relates to improvements in phonographs and hasreference morepa'rticularly to an improvement by means of which anordinaryautomatic phonograph can be made to play many standard sizerecords (either or 12 inch) that are to be played in regular sequence.Such records usually have recordings on both sides. When an ordinaryautomatic phonograph 'is em- ;ployed, there is a break in the continuitywhile the record is turnedand also when another record f-is substituted.

.It has been. found that an ordinary automatic phonograph requires aboutfifteen seconds for the operation of turning, or, for the changing of arecord. The auxiliary transcribing device which forms the subject ofthis invention will continue the music during this time interval,thereby providing an uninterrupted rendition.

My invention, briefly described, and in its broadest aspect, consists ininterposihg in the circuit between the electric tone arm of theautomatic phonograph and its loud speaker, a device which will recordthe sound waves, corresponding to the record being played, ontoanother're'c- 0rd and transmit them to the loud speaker at asufficiently reduced tempo to lengthen the sound reproduction periodsufficiently to cover the gap of fifteen seconds necessary for changingthe records on the phonograph.

My attachment, in its present embodiment, comprises a sound recorder andtranscriber of the type known as the Poul'sen telegraphone, which isconnected with the electric pickup on the tone arm of the phonograph insuch a way that a steel wire becomes magnetized in a mannercorresponding to the sound waves. An electric pickup of a type thatresponds to variations of the magnetism of the wire, generates anelectrio current which is then subjected to amplification andtransmitted to the loud speaker. The attachment or auxiliary transcriberis so constructed that it will conti'nuethe operation of'the loudspeaker 'ior about fifteen seconds aftrthe playingof-the original recordhas been completed. The auxiliary attachment for at least a periodbi thetime, records and reproduces the music at a slower tempo'than the"original thus prolonging the'souhd some time after the original recordhas been played.

Although a transcriber of the telegi'aphonetype will be used forexplaining the invention, it is evident that a transcriber employing adisk reco'rdcan be used. H

In order to describe the invention so that its construction, mode ofoperation, and its relation to the brigina'l phonograph canbereadiIyundeF stood, reference will be hadto the accompanying drawingsin which the invention has been illustrated, and in which:

Figure 1 isa diagramshowingth'e generalar ran'geme'nt and relationshipof the several ele-- merits; I

Figure 2 is a perspective view '01 'thetraris'cfib irig attachment,partsbeing broken away to better disclose the construction;

Figures 3 and 4 areuiagrams for use in 'de-' scribing and eaplainirigtheoperation;

Figures 5 and'sa are ViWSiIl-iltffitirig' the 00hstruction of the magnetpoies empm ed;

Figure 6 is a diagram mus-trance, means or preventing a new "record frombeing stfa'ite'd. the phonograph 'uiitil the record oh the tram scriberis finished; I

Figure 7"i11ustates 'a 'iheans for automatically changing the fndt'orspeed; and

Figur'etis a diagram showing one means for retarding "the speed shiftingmechanism to coinpe'nsate for the time e ement due'to the'relativemovement ofiecord i2 and recording magnet. '9

Refeiehcewillnow be had to the drawings and to the sever-a1 figures'thefeon whre the various elements havebeen'd'esignated, either byreference characters, or by numbers.

In Figure '1 the several elements of this machine have'beeh indica'tedin a general way. The automatic phonograph has been designatedby P; theseries of records we; the tone ar'mbyT'rij the tone arm amplifier byTAA; the transcriber by T; the power ampl fier byPlajthe loud speaker byL; and the "monieritaryeohtact switch by sex. Since electronicamplifiers are old and well known, the specific arrangement and/or thecircuits'h'ave n'dtbeen shown. The transcriber has been illustrated inFigure 2 to which reference will. now be had.

Reference numeral I designates a base on is supported a frame having atleast two upright m'ei'nbers 2 and a transverse member 3. A shaft oftubular shaft 7.

4 is journalled in bearing 5 on the base and in bearing 6 in thetransverse member. Surrounding this shaft is a tubular shaft "i thatcarries an arm {to the end of which is secured a recording mag net 9. Asound record it is carried by the upper end of shaft 4 and comprises acylinder I I of nonmagnetic material such as aluminum or copper, or somesuitable synthetic, preferably a nonconductor of electricity. Embeddedin the cylinder tion indicated by A in Figures 3 and 4. When magnet 23is energized, in a manner to be hereinafter explained, it moves theplunger and the inclined end portion 18 upwardly, thereby returningpinions 23 and 24 to the position shown in drawing and at the same time46 moves the I6 is secured'to shaft l? and shaft 85 is slidable,

but nonrotatably connected therewith. Shafts "l5 and H are J'ournaled,respectively, in the upright frame members 18 and i9. Shaft 4 carriestwo gears 20 and 2 I, which are concentric and of different sizes,'asshown in the drawing. A gear 22 is nonrotatably connected with the lowerend Shaft ll carries'pinions 223 and24. In theposition shown'in thedrawing,

7 pinion 23 meshes with gear 22 and pinion 2d with gear 23. Shaft llcarries a spool-like member 25 between the flanges of which arepositioned fingers 26, comprising the lower end of the downwardlyprojecting fingers' 2? of the bell crank lever. The bell crank lever ispivoted at 23 and a V has a horizontal arm 29 that extends to both sidesof the pivot so as to form with arm 2? an unsymmetrical cross. When thebell cranklever is rotated in a counterclockwise direction, it movespinion 24 into engagement with gear 2%, and disconnects pinion 23 fromgear 22, whereupon tub'ular'shaft- 1 stops rotating. While pinions 23 iand 24 and gears 20, 2| and 22 have been shown as provided with teeth, asuitable friction gear may be substituted if found desirable. A worm.3Elis secured to the tubular shaft and engages a gear 31 on shaft 32. Adisk 33 is carried by shaft 32 and has a notch 34 for the reception ofarm 29. Whenever notch 32 gets into. position directly above this arm,the bell crank' arm 29 moves into the notch and shifts the gears asabove explained. I

It will be observed that pinions 23 and gears 22 and 20 produce relativerotation of shafts 4 and 1 in opposite directions. For the purpose ofthis description the record Iii will rotate in a counterclockwisedirection, as indicated -by the arrows, and recording magnet 9 willrotate in the opposite direction but at a much slower speed. Secured toone of the frame members 2 is a bracket 35 that carries a takeoff magnet35 and an eraser magnet 37. Carried by the tubular shaft are two sliprings 38 to which the ends 39 of the soleprevent it, the music 7different tempos.

noid winding on therecording magnet are 0011-" nected. Brushes 49contact with the slip rings and these in turn are connected to terminalsM by means of wires 42. A magnet 43 is supported on thetransverse framemember 44. A plunger armature s5 is associated with magnet 43 and has aslotted opening for the reception of'the short end of arm 29; Whenmagnetl} isdeenergized, 'the weight of the armature rests on thearm 2eand urges the long end of this v arm' upwardly against disk 33;

lever will rotate in a counterclockwise direction and move pinions 23and 24 out of engagement the'recording. magnet will cease to rotate andshaft 4 will rotate at 'a slower speed. This takes place when therecording magnet is above the inclined extension 46 of plunger 45 in theposiand therefore Whenever slot 34 gets into position above arm 29, thebell crank -of time that recording'magnet 9 rotates is dependent on thespeed ratio of the worm gear (30, Si) and it may make several completerevolutions before notch 34 reaches a position above 29. The relativespeeds at which 9 and i0 rotate and the number of revolutions made bythe recorder magnet 9 determine the increased distance traveled by therecord lilrelative to the recorder,

ll over what this distance would have been if recorder t had remainedstationary and this in turn determines the time the transcriber willcontinue to play after recorder 9 becomes inactive. This time intervalmust be long enough to permit the automatic phonograph to change recordswhich is about fifteen seconds.

In Figure 3 an attempt has been made to illustrate the severalpositions. A shows the stationary position of the recorder 9 after leverarm 29 has moved into notch 34 and until magnet 43 is energized causingcam 96 to move the recorder from position A to position B. The number ofcomplete turns that therecorder 9 makes while disk 33 makes one completerevolution determines the extent to which the record has been lengthenedand the time it will continue to play after recorder 9 becomes inactive.

It will be observed that record Ill will be lengthened, due to themovement of the recorder magnet 9, in the opposite direction from thatof record'i 6, and therefore the music or other sound will have a slowertempo than that of the master record on the phonograph. This isnecessary in order to gain the time necessary for changing the record onthe phonograph. That part of record i0 that is recorded after therecorder 9 has stopped in position A will have the same tempo as that ofthe master record; It is now apparent that unless some means is providedto will be reproduced at two Practically'all makes and types ofautomatic phonographs operate at a turntablespeed of 80 R. P. M. whichpermits an ordinary 10-inch record to be played in from two and one-halfto three minutes. The transcriber lengthens the time aboutfifteensecondsand in order to produce an audible rendition at the original tempo ofthat part recorded while the recorder 2 moves, the speed ofthephonograph turntable must be increased during this period or else recordI'll must be rotated at a slower speed until recorder 9 7 stops and thenat a higher speed; in the example given, this construction has beenshown.

Referring toFigure' 2, it will be observed that as long as shaft 1turns, pinion 24 is in engagement with gear 20, but as soon as thepinions are shifted to disengage pinion 23 from gear 22, pinion 24 willmove into engagement with the smaller gear 2i and increase the speed ofshaft 4. In the drawing the gears have been shown more on 1658idiagrammatically-L but it is. to, be a under-- stood' that the gearratiosmust; be: carefully calmnlace. of changing; the speed'of motor i3,it. possible; to run the motor of the automaticv phono raph: semcwhat;higher during. the time that recorder 9 rotates anditzo reduce thisspeed. toinormahwhen lever 29; moves intonotch 34.

It:w is; of. course, understood that both the:

recorder: magnet. and: the. takeoff magnet havelaminatedr comes so. as.to. reduce the hysteresis and: the resultant. magnetic 1 lag and heat toa minimum. Gmes. and; other parts. made from compressed; powdered: ironor any othersuitable material mayvbe used.

It is evident that theseveral magnets must be pnovid'ed i withspecially; constructed pole pieces for thepurpose of followingthespirals of the magnetizable wire record l2; the construction adoptedfor this purpose will nowbedescribed amt reference for this purpose willbe had to Figuresfi and 5w.

Referring now-'to-Figure 5, which is partly in section; the-corehasbeendesignated by 50' and this terminatesin a triangular end 5|. Threepulleys 52" have beenmounted" for rotation on pivots 5%: A chain 54"comprising a series of hingedly connected links, encircles the pulleys.-

Pole pieces 55 are attached to the chain and spacedequidistantlythereon; as shown more clearly in- Figure 511 from which-itwill be seen tliat-theopposite interior'base angles aresomewhatsmallerrthan those shown inFigure 5. The

cylindrical? wall of record Ill in which the wire theridgesv Biiandptherefore when-record l0 turns.

relative" to the pole pieces, the latter will move downwardly;The-parts, are so proportioned and arrangedjthatbefore the lower polepiece leaves the record: the upper one will be in position. The numberof turns of wire I2 between the pole pieces'1 must be of "sufiicientlength to record a lfi incl'r record. This'is, however; notan, essentialrequirement as will later appear. Pole pieces Won the pickup magnet 36and the eraser magnet 31 engage the samespiral ridge a few inches apartwhereas pole piece 55'on recorder magnet 9'*may engage a ridge'spacedseveral-turns away: Whenever recorder 9 is in positionv Bit mustbe onthesame helical coil'as 36'and3l.

In Figures 3 and 4 the pole pieces have been shown pointed in ordertosimplify the drawing.

It is to be understood" that the poles must be of" such construction"thatthey will 'followthespiral ridges;

Alrrecords are not of the same length even when; of the same diameter.especially; ofa series, is likely to be shorter than the others;., anyone or all of the records of a series'may be of*difier,ent,length.Unless means is provided" for" preventing such an occurrence,

The last record the automatic: phonograph; atterihaving: platt d? arecord of average length followedsb record. would chan e 1' records;and; begins tor play another: before: the. transcriber; had: completed;1 a.

i to be. engagechand'i closedrrw-hen; the toneamris:

moved: into; operative position. bythe automatim mechanism In. Figure 2.the sameswitch has: beenv shown: as controlling the: flow of current?from i a. source of electric current supply; suclraasf the batt'eryrBw,to the mag-net 43: Assoon there fore as the tonearm-TA is: moved'intmoperative engagement with the record on the; turntables magnet 433'is energized and cam 46 moves the recorder magnet fl -fromposition A toposition- B (Figs. 3 and 4) and: the-recorder begins at onceto=magnetize wire l2 in-accordance wit-hthenew record. It is necessarytha-tno new recordingbemade' on wire I 2 until the-last1 notes havepassed the pole of recorder magnet 9= whenirr position-B;

In order toprevent overlapping of magneticrecordings on wire l2; thefollowing means havebeen provided.

Referringnow to' Figure'fi; it *wi11 be notedthat a magnet 58-: has beenpositionedadjacent the pickup" magnet 36' in'position tohave acurrentinduced in its" windingwhen the magnetized record l 2-= passes its pole.The terminals of the winding of magnet 58 areconnectedby; wiires-59 andGilto a'relay filthat is'heldin open-position as long-as acurrent is'fiowing through wir'es-59'*- and- 60: Such rela-ysare-availableand-the=con-- struct-ion has thereforenot beenillustrated-z lever-62' is "pivoted to the-tonearmat== 63:; onc end isbent downwardly and provided with aroller 64 positionedtoengagewtheupper surface of arecord: The-otherend or lever 62 extendsupwardly as indicated at 55; magnet fih iscam ri'ed 'by the tone armadii'acent'itspivoted end ancf this hasan armature 6*! pivoted-:at- 6i?and held" in such aposition by a spring 6=9 that the end of arm 65 willengage it and thereby hold-thetone arm in such position that the pickupneedle-can not come into engagement with the record:- When the erasedportion of wire I? reaches' a* point under thepole ot magnet-"5a, nocurrent is induced inthe-winding and-relay B lclOses; thereby-energizing magnet 66 which attracts armature 61' and-releases-lever-6'2; permitting? the tone-arm to dropandpla'ce' the pickupneedl'einto engagement-with the record. When electromagnet Bit-is energized'and' the tone -arm drops into operative position, switch SjwX closesand energizes magnet" 43, moving recorder 9* from. position. A toposition. B and shifting. pinions 23" and Z'4into the position shown inFigure 2; whereupon .a new record. wil1.be recorded on wire 12.andttranscribed into musicorsound;

It 1 is, of. course, understood. that. the. automatic shorten: I

. 7 r p'lifiedby the power amplifier 1 A transmitted to the loudspeaker.

The operation of the device is as follows: A

number of records R which are to be played in succession are arranged inorder in the automatic" phonograph; The several elements are connectedas shown and described. The current generated by the electric pickup onthe tone arm of the.phonograph energizes the coil on magnet S and thepole 55 of the lattermagnetizes wire I2.

When the magnetized portion of wire I 2 passes the pole 55 of pickupmagnet 36, a current is in :duced in itswinding and this is amplifiedand transmitted to the loud speaker Magnet 37 WhiCh is energized by aconstant direct current,

erases the magnetic record from wire l2 immedi creases the-length ofwire between its pole and :ately after it has served its purpose inconnection with magnet Recorder'magnet 9 moves in the :opposit-edirection to wire it and gradually inthat ofmagnet '35 until thedistance will result 7 in a playing time of about fifteen seconds orsufii cient for the automatic phonograph to. change records, anotherrecord is to be recorded. a Means have been described for correcting forlhe recorder magnet then stops until the slower tempo that resultsfromthe movement,

of magnet 9 during a portion of the recording, and for correcting thespeed of the phonograph turntable or of the'record iii to maintaintheoriginal tempo, both during the time magnet 9 moves as well as when itstands still. Means comprising switch SwX and magnet 43' shifts theposition of magnets at the beginning of each record and; means has alsobeen provided for 'preventing overlapping of recordings on Wire l2 Itis; evident that specifically different mechanisms may be usedand it iseven possible to re-. place the telegraphone type of transcriber by oneusing ordinary records and a'pplicant therefore considers that hisinvention embraces the combination disclosed regardless of the formand/or construction of thevarious elements'so long as -,the elementsperform the same function insube stantially the same way. r

Sincepractically all records manufactured are turntables rotate 80 R. P.M. the normal tempo of such records is attained only when they arerotated at, this speed. If the record is rotated at .;a=higher speedthan this, the tempowill be above uiormal and vice versa.

It is evident that the music or sound emitted :from the loud speakermusthave normal tempo.

'i-isturning, it follows that for the period that the recorders movesina direction counter to that io'f1 record lit, the turntable ofthephonograph must rotate sufii ciently above the normal speedto-producea normal tempo of the transcribed grriusic. 'Io;accomplishthis the phonograph motor must be speeded up during the timethat the record ll-is rotating and reduced to normal speed when therecord stops. Means for accomplishing this isshown in Figure '7 7 Theiiivention has been illustrated and described in connection witha devicefor reproducin'gj sound. ,It is to be understood that protection 'isd'esired for any and all uses to which the invention can be put; .If itis found thatthe device can ,Vbeused for television ,or any otherpurpose requiring the reproduction of electric curintended to belusedwith phonographs whose" 8 rents having specialwave forms andfrequencies, such use is contemplated.

The niagnetizable wire helix may be formed from any suitable materialthat can be magnetized and which will retain its'magnetism for a cientlength of time to efiect the results desired. Certain kinds of steel aresuitable and in addition such alloys as are now used for makingpermanent magnets.

It has been pointed out that the sound waves which are transcribeduponthe electromagnetic record during the normal transcribing speed, whichis an additive result of the drum speedplus the rate of the recordermagnet advance, will be delivered into the takeoff element at highertempo during a brief interval immediately following the arresting of therecorder magnet and the shifting of the drum speed at the conclusion ofa predetermined period.

At this time, the relationship of the various elements will besubstantially as shown in Figure 4," when the'recorder 9-is shown inposition A, and approximately one full turn of the record wire 52separates the recorder 9 from the takeoff magnet 3. Assuming the normalrotating speed of the drum to be R. P. M., this increased tempo mayresult in distortion of the sound rendition for approximately /80 of aminute until the portion of the electromagnetic record, properlyadjusted to the increased drum speed, reaches the takeoff magnet 3.

For the purpose of preventing a sudden changein tempo when the recordermagnet stops at point A the change in speed of the record l2 must remainthe same until the point on record [2 reaches the pickup magnet 36,whichshould be 7 between pins 73 is greater than-the width of lever.

H to provide a lost motion connection. Shaft can move towards the righta sufficient distance to disengage pinion 23 from gear 22 before thedashpot becomes effective. Pinion 2d is quite wide as shown and theparts are adjusted so that it will take approximately fifteen secondsfor' pinion '24 to disengage gear 2i! and engage gear The above ismerely illustrative of means for this purpose and any mechanicalequivalent can besubstituted. a

. Having described theinvention what is claimed as new is: V

1. A' mechanism for playing records in sequence, comprising; means forrotating a' record at a-predetermined constant speed, anelectric pickupoperatively associated with a record adapted to be carried by the recordrotating" means, a sound recording device operatively connected with theelectric pickup, means translating the sound recordings into an electriccurrent having amplitude and frequenc characteristics corresponding totherecorded sound, an electro dynamic loud speaker, means transmittingourrent from the translating means to the loud speaker including. anelectronic amplifier, said sound recording device including recordingmeans,

an element upon which the recording. means records the sound, therecording means and translating means being relatively movable withrespect to said element, the rate of relative movement of the recordingmeans being greater than that of the translating means whereby apredetermined rate of decrease in the tempo of the sound emitted by theloud speaker relative to that of the record is effected, to obtain atime lag, and the loud speaker as a result of said decrease in tempowill continue functioning a sufficient time after the electric pickupand recording means become inoperative, to provide sumcient time tochange to another record of the sequence.

2. In a continuously playing phonograph having a turntable adapted tocarry records in sequence, a tone arm carrying an electric pickup deviceoperatively associated with a record carried by the turntable, means forrotating the turntable at a predetermined constant speed, and means forlifting the electric pickup from the record and for replacing a playedrecord with another; means translating electric current generated by thepickup into audible sound waves comprising a sound recording deviceincluding a movable magnetizable wire operatively associated with theelectric pickup by means of a recorder magnet operatively associatedwith the movable magnetizable wire, means for translating the recordingson the wire into a variable electric current having the same wave formand amplitude characteristics as the current generated by the pickup,comprising a take-01f magnet operatively associated with the wirerecord, means for trans-- lating the current generated in the takeoffmagnet into audible sound, comprising an amplifying device and a loudspeaker operatively associated with the take-ofi magnet, and means forprogressively increasing the distance between the recorder magnet andthe take-off magnet along the wire to decrease the tempo of the currentin the take-01f magnet relative to that in the recorder magnet.

3. A continuously playing phonograph comprising, a turntable, a soundrecord supported thereon, an electric pickup operatively associated withthe record, means for rotating the turntable and record at apredetermined constant speed, a helical coil of magnetizable wire, abase on which the coil is supported, means rotating the coil about itsaxis, a recorder electromagnet carried by the base, said magnet having apole positioned adjacent the wire whereby the latter will be magnetizedin response to variations in the magnetic flux from the pole, meansvarying the magnetization of the pole in accordance with the variationsin intensity, frequency and characteristics of the current generated bythe electric pickup, comprising an electronic amplifier in a circuitinterposed between and operatively connected with the recorderelectromagnet and the electric pickup, a take-ofl electromagnetpositioned with its pole in inductive relation to the wire, the lastnamed electromagnet being stationary relative to the frame, means formoving the first named magnet in a path parallel to the wire in thedirection opposite to that which the wire travels but at a slower speedwhereby the space between the two magnets will gradually increase, anelectromagnetic loud speaker, means comprising a circuit in series withthe magnet windings of the 10 take-off magnet and of the loud speakerand an electronic amplifier in the circuit, for operating the loudspeaker, whereby the variations in the magnetism of the wire will betranslated into sound waves, and an eraser magnet operatively 7associated with the take-off magnet and the wire, and spaced from thelatter in the direction of wire travel.

4. A continuous phonograph comprising, a continuously rotatingturntable, a sound record supported thereon for rotation therewith, anelectric pick-up operatively associated with the record, a continuouslymoving magnetizable wire record, a recorder magnet of the telegraphonetype positioned in operative relation to the wire, means including anamplifying device and circuit connections for energizing the recordermagnet by current from the pick-up, a take-off magnet positioned inoperative relation to the wire record, a a

sound reproducing device, a circuit including a power amplifierconnecting the take-off magnet with the sound reproducer, and means forprogressively increasing the distance between the recorder magnet andthe take-off magnet along the wire to progressively decrease the tempoof the sound emitted by the sound reproducing device relative to thetempo of the record, whereby the sound will continue to be reproducedafter the recorder magnet has ceased to function.

5. A device for reproducing the recorded sound from a plurality ofphonograph records played with short time intervals between them, sothat the reproduced sound will be continuous, comprising in combination,an automatic phonograph having a turntable, a record mounted thereon,means for rotating the turntable, an electric pickup operativelyassociated with the record, and means for lifting the pick-up andsubstituting another record for the one just finished, means forreproducing the sounds in unbroken sequence and at a slower tempoconsisting of a constantly moving magnetizable wire record, a recordermagnet mounted adjacent the wire for relative movement therealong, meansfor energizing the recorder magnet by current from the electric pickup,comprising a circuit containing an amplifying device, a take-oil" magnetpositioned adjacent the wire record and spaced from the recorder magnetin the direction of movement of the wire, means for increasing thedistance between the recorder magnet and the take-oil magnet along thewire to decrease the tempo of the electric current induced in thetake-off magnet relative to that of the electric pick-up, a loudspeaker, and means for energizing the loud speaker from the take-offmagnet comprising a circuit containing a power amplifier.

ROBERT E. STANTON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,780,414 Andres Nov. 4, 19302,038,647 Clausen Apr. 28, 1936 2,170,751 Gabrilovitch Aug. 22, 19392,362,803 Clausen Nov. 14, 1944 2,380,392 Begun July 31, 1945

